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1994 Geo Prizm Question: What causes the car not to idle when cold but fine when warm. When you first

 

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oaktree mechanic, 1.6L 4 Cylinder, Easley, SC, February 03, 2014, 05:21
 Rookie

Crank it you have to two foot it, its like the choke not picking up but once it warms up it is fine please help teenage daughters car

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    February 03, 2014, 05:31
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     Master

    Light on in dash? Needs to be scanned, possible coolant tempture sensor reading incorrectly. Needs to be scanned!!

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    oaktree mechanic, February 03, 2014, 05:50
     Rookie

    No lights on ,temp gauge does read a little cooler than her other one she had a 96

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    pushrod, February 03, 2014, 05:55
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     Master

    Scanner will read the signal from the sensor to see if it's right plus other live data can be read to help determine the problem. Cant guess at it,, wont help! The coolant temp SENSOR is not the same as the tempture SENDING unit for the gauge! It tells the computer what ambient tempture is and if the reading is wrong, so will be the amount of fuel sent to the engine! It is basically the choke as we know it.

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    oaktree mechanic, February 03, 2014, 06:11
     Rookie

    Oh Ok so even if there's no light on, the computer could b getting a reading of some sort, didn't realize the temp could effect idle, I'm old school simple Chevrolet's, will take & have scanned hope tells me something , if I know what's wrong I can fix , thanks so much will let u know the outcome

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    pushrod, February 03, 2014, 06:16
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     Master

    You welcom. Yeah,the sensor can be out of range and not turn on the light! Best way to check it is with a scanner hooked up while engine is cold, it should read ambient tempture, just like a thermometer. Now a parts store cant SCAN test it,,they can only read codes, but cant even do that on this vehicle anyway. NAPA part # for the sensor is TS6677SB.

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